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MA: Fachverband Magnetismus
MA 54: Spin: Transport, Orbitronics and Hall Effects II
MA 54.2: Vortrag
Donnerstag, 19. März 2020, 15:15–15:30, HSZ 403
Paramagnetic molecules on Fe3O4 as a spin-current detector — •Tanja Strusch1, Ralf Meckenstock1, Yulia Nalench2, Maxim Abakumov2, Michael Farle1, and Ulf Wiedwald1 — 1Faculty of Physics and CENIDE, University of Duisburg-Essen, Lotharstr. 1, 47048 Duisburg, Germany — 2National University of Science and Technology NUST MISIS, Moscow, Russian Federation
Pure spin current based devices are considered for future low dissipation electronics. An interfacial molecular paramagnet has been used as a spin current detector (IMPSD) [1] as an alternative detection scheme for the inverse spin Hall effect [2]. We extended the IMPSD to enhance the sensitivity, by enclosing an electron spin resonance (EPR) marker to a ferromagnetic interface which has two overlapping distinguishable EPR centers. Thus, we detect the influence of the spin current on the EPR centers resulting in an additional contribution to the power dependence of the two EPR modes. The chosen sample system is a Fe3O4 nanoparticle (NP) with oleic acid (OA) as a surfactant. The first EPR mode S1 is directly located at the OA-Fe3O4 interface and the second S2 at the double bond in the carbon chain [1]. If the ferromagnetic resonance of the Fe3O4-NP is tuned to the resonance field of the EPR line S1 (short lifetime), the number of excited paramagnetic centers increased. Due to the larger lifetime of S2 the additional excitation of S1 leads to an even stronger excitation of S2.
[1] T. Marzi et al., Phys. Rev. Applied 10, 054002 (2018).
[2] E. Saitoh et al., Appl. Phys. Lett. 88, 182509 (2006).